|
|
|
| Statistic Inspection for the Thermoelectric Characteristic of Reference Pt/Rh10-Pt Thermocouples |
| ZHENG Wei1,TANG Lei1,MENG Xian-zhe2,WU Shuang-shuang3 |
1. National Institute of Metrology, Beijing 100029, China
2. Xi′an Institute of Measurement and Testing Technology
Xi′an, Shaanxi 710068,China; 3. Hunan Institute of Metrology and Test, Changsha, Hunan 410014, China |
|
|
|
|
Abstract The historical verification datum of an amount of reference Pt/Rh10-Pt thermocouples from multiple institutes are statistically inspected . The thermocouples were observed of stable thermoelectric characteristic that the annual mean of the emf drift close to 0μV at freezing fixed points of Cu, Al, Zn with standard deviation 1.0μV,0.6μV and 0.4μV respectively. The histograms of datum at fixed points were nearly normal distribution; the annual emf drift characteristic of individual thermocouple at fixed point appeared in strong biserial correlation. The emf of those thermocouples was observed slightly increasing with time. The inspection demonstrated under the normal condition that no correlation existed between emf drift and frequency in use.
|
|
|
|
|
|
|
|
［1］国家质量技术监督局JJF 1059—1999,测量不确定度评定与表示规范［S］.1999.
［2］国家质量技术监督局JJG 833—2007,标准组铂铑10-铂热电偶［S］.2007.
［3］国家质量技术监督局JJG75—1995,标准铂铑10－铂热电偶检定规程［S］.2000.
［4］倪育才 实用测量不确定度评定［M］.北京:中国计量出版社,2007.
［5］Quinn T J. Temperature［M］.北京:中国计量出版社1986
［6］戴乐山,凌善康 温度计量［M］.北京:中国标准出版社 1984. |
|
|
|
2015, Vol. 36 
